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Xing D.,Agricultural University of Hebei | Li S.-W.,Agricultural University of Hebei | Li S.-W.,Hebei Province Key Laboratory for Farmland Eco Environment | Xia B.,Agricultural University of Hebei | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2015

In order to evaluate the threshold of phosphorus (P) application rate and improve the utilization efficiency of fertilizers in Baoding region of Hebei Province, a field experiment was conducted to examine the impacts of P fertilization on wheat yield, soil NO3 --N and nitrogen use efficiency. Results showed that, compared with the CK (P0), all treatments with P application (P1, 120 kg·hm-2; P2, 240 kg·hm-2and P3, 480 kg·hm-2) increased the plant height, flag leaf areas and total leaf areas per plant of winter wheat, which was conducive to the accumulation of photosynthetic products. In addition, P application increased the spike number, kernels per spike and yield of winter wheat but slightly decreased the grain mass per 1000 seeds. Of the P-fertilized treatments, P2 had the highest wheat yield of 6102 kg·hm-2, which was similar to P1 but significantly greater than those of P0 and P3. Furthermore, P fertilization reduced the NO3 --N content in top soil layer although the total accumulation of NO3 - was still rather high. The N grain production efficiencies (GPEN) and N uptake efficiencies (UEN) of P1and P2 were similar but greater than the other treatments. The use efficiency (URP), agronomic efficiency (AEP) and partial productivity of P fertilizer (PFPP) in P1 were significantly greater than P2 and P3. In conclusion, the P application rate of 120 kg·hm-2(P1) in this study could be an appropriate threshold in Baoding, Hebei, from the aspects of wheat yield, nitrogen and phosphate use efficiencies and accumulation of soil NO3 -. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.

Liu J.-T.,Agricultural University of Hebei | Liu J.-T.,Hebei Province Key Laboratory for Farmland Eco Environment | Xu J.,Agricultural University of Hebei | Sun Z.-M.,Agricultural University of Hebei | And 4 more authors.
Chinese Journal of Applied Ecology | Year: 2014

Laboratory incubation experiments were conducted to compare the inhibitory effects of dicyandiamide (DCD) and 3,5-dimethylpyrazole (DMP) on nitrification in meadow-cinnamon soil and fluvo-aquic soil, the main soil types of North China Plain. The synergistic effect of DMP combined with urease inhibitor hydroquinone (HQ) on nitrogen transformation in fluvo-aquic soil was further studied. The results indicated that, in contrast to DCD, DMP had a stronger inhibitory effect on the nitrification in the two tested soils. In comparison with the treatment without any inhibitor, the soil NH4 +-N content in the treatment with DMP increased significantly by 149.5%-387.2% at the peak of nitrogen transformation stage, and the soil NO3 --N content reduced by 22.3%-55.3%. The inhibitory effects of DCD and DMP in fluvo-aquic soil were both stronger than in meadow-cinnamon soil. In addition, the application of DMP combined with HQ had a significantly synergistic effect on soil nitrogen transformation.

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